mixy imxy mxiy xmiy ixmy ximy miyx imyx myix ymix iymx yimx mxyi xmyi myxi ymxi xymi yxmi ixym xiym iyxm yixm xyim yxim
Note: these 'words' (valid or invalid) are all the permutations of the word mixy. These words are obtained by scrambling the letters in mixy.